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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b05a53482d198a7821e2aafc3cbb6a93e588712c7b325dc4c422a752ed886fd' 
  AND token = 'p4IxYdGdZyIqrx6i9fY/nNUgFQ1TdxLbrxz7zU3EvX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}